A capillary tube of radius 1 min is kept vertical with the lower end in water. (a) Find the height of water raised in the capillary. (b) If the length of the capillary tube is half the answer of part. (a), find the angle θ made by the rater surface in the capillary with the wall.
(a) 1.5 cm
(b) 60o
Given, surface tension of water, 
Radius of the capillary tube, 
As the liquid is water, it will concave upwards.
The rise is given by, 
(b) Given, length of capillary, 
The rise is given by 
—————(1)
And 
—————(2)
Dividing (1) by (2)
1